I would like to pass this information on because I don't think there are many who know this.

When you place a vehicle with it's fuel cap next to the gas truck, at the height of the jerrycan that is attached to the left side of the truck, and you stand between the truck and your vehicle, you get the action fuel it up. In this way you can refuel the vehicle (car and heli).

I use the truck to give players a chance to refuel their vehicle at my traders.

This truck: Picture of the truck